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Search Results: 1 - 10 of 120167 matches for " Minggang Wang "
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Non-wandering Operator in Bargmann Space
Minggang Wang,Hua Xu
Journal of Mathematics Research , 2010, DOI: 10.5539/jmr.v2n2p34
Abstract: In this paper the Bargmann space is denoted by F. This space’s roots can be found in mathematical problem of relativistic physics or in quantum optics. In physics the Bargmann space contains the canonical coherent states, so it is the main tool for studying the bosonic coherent state theory of radiation field and for other application .This paper deals with the unilateral backward shift operator T on a Bargmann space F. We provide a sufficient condition for an unbounded operator to be non-wandering operator, and then apply the condition to give a necessary and sufficient condition in order that T be a non-wandering operator.
A Novel Four-Dimensional Energy-Saving and Emission-Reduction System and Its Linear Feedback Control
Minggang Wang,Hua Xu
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/842716
Abstract: This paper reports a new four-dimensional energy-saving and emission-reduction chaotic system. The system is obtained in accordance with the complicated relationship between energy saving and emission reduction, carbon emission, economic growth, and new energy development. The dynamics behavior of the system will be analyzed by means of Lyapunov exponents and equilibrium points. Linear feedback control methods are used to suppress chaos to unstable equilibrium. Numerical simulations are presented to show these results. 1. Introduction Since energy saving and emission reduction is the most effective way to control carbon emissions, how to promote energy saving and emission reduction is becoming the hot topic of academic research. Calculation and control analysis of carbon emissions have attracted a great deal of attention from various fields of researchers. Feng et al. [1] conducted a research on the long-run equilibrium relationships, temporal dynamic relationships, and causal relationships between energy consumption structure, economic structure, and energy intensity in China. In order to decrease energy intensity, the Chinese government should continue to reduce the proportion of coal in energy consumption, increase the utilization efficiency of coal, and promote the upgrade of economic structure. Amjad et al. [2] indicated that petroleum is the major energy consumption of most of the nations in the world, so taking actions to reduce the petroleum consumption, such as replacing the diesel locomotive with hybrid electrical vehicle, could reduce humans dependence on petroleum and hence decrease carbon emissions. Liao [3] analyzed the role of developing hydro-energy, wind energy, nuclear power, and so forth. Guo et al. [4] found technical innovations and standard management a decisive role in the energy use per unit of GDP, for which the ratio of oil consumption was the major limiting factor. Mendiluce et al. [5] compared the evolution of energy intensity in Spain with that in the EU15 and found the increasing of energy intensity in Spain since 1990 is mainly due to strong transport growth and the construction boom. From the above analysis, we can see that previous researches mainly explored the influence of energy intensity by energy structures, technical change and management level, energy consumption structure, economic structure, energy prices, and so on [4, 6]. Some were proceeded from the world or state perspectives [4–6], some from provincial and local governments perspectives [7, 8], which figured out the variables which influence energy
The Application of a New Neutron Induced Gamma Ray Spectroscopy Tool in Evaluation the Shale Gas in Fuling Shale Gas Field  [PDF]
Wei Yan, Minggang Feng, Yue Wang, Shuai Liu, Kaixuan Li, Xianran Zhao, Wenjun Liang
Open Journal of Yangtze Oil and Gas (OJOGas) , 2018, DOI: 10.4236/ojogas.2018.32008
Abstract: Shale gas reservoir is characterized by complex lithology with ultra-low porosity and permeability, which brings many challenges in the formation evaluation. Elemental Capture Spectroscopy Sonde (ECS) can be used to measure the elements and get the formation of the mineralogy. LithoScanner is a newly-generated spectroscopy tool, which can be used to measure both inelastic and capture spectra, providing estimation of more elements, including silicon, calcium, iron, sulfur, titanium, gadolinium, aluminum, potassium, sodium, magnesium, manganese, carbon, etc. LithoScanner can be directly used to measure the total organic carbon content (TOC) in the formation, and provide solutions to the lithology classification and heterogeneous rock analysis (HRA). The changing lithology and borehole rugosity have little influence on the direct measurement of TOC by LithoScanner. LithoScanner shows great advantage in accuracy when comparing with other methods using triple-combo. The systematic lithology classification method in shale gas reservoir using LithoScanner is correlatable in multi-wells. The brittleness index from mineralogy can be applied to hydraulic stimulation. HRA results offered guides in both the coring sample selection and the experiment. The advantages of LithoScanner in shale gas formation evaluation were presented in this paper, and the workflow can also be applied to other reservoirs.
AN INVESTIGATION ON THE BILINGUAL TIBETANS''ATTITUDETOWARD THEIR NATIVE LANGUAGE AND CHINESE
藏族双语人双语态度的调查研究

Wan Minggang Wang Jian,
万明钢
,王鉴

心理学报 , 1997,
Abstract: Questionnaires, interviews and observations were used to investigate bilingual Tibetan adults, attitude toward their native language and Chinese, their attitude toward the selection of Tibetan or Chinese in different communicative contexts, and their attitude toward the transformation of one language code into another The result of the investigation showed that most of the bilingual people have a deep feeling for their native language, and a strong inclination to keep their own language. The factor of feeling plays an important part in the attitude of the bilingual people toward their native language, while in the attitude toward Chinese language their is something more rational or cognitive than emotional. They show a positive attitude toward learing Chinese in order to master it. but when it comes to the viewpoint of replacing Tibetan with Chinese, their attitude turns to be negative, Bilingual people mainly use their own language in the family and among their own people. lf one Tibetan speaks in Tibetan,while the other responds in Chinese or in Tibetan mingled with Chinese, it is not welcome.
Improved method for analyzing the degradation of estrogens in water by solid-phase extraction coupled with ultra performance liquid chromatography-ultraviolet detection

Minggang Zheng,Ling Wang,Yuandui Bi,Feng Liu,

环境科学学报(英文版) , 2011,
Abstract: We established an improved method for the determination of four estrogens including estriol (E3), 17β-estradiol (E2), 17α-ethynyl-estrodiol (EE2) and estrone (E1) in water. The method consisted of solid-phase extraction (0.5 L water) and subsequent analysis of analytes by ultra-performance liquid chromatography (UPLC) with an ultraviolet detector (UVD). Base-line separation was achieved for all studied estrogens using a column (50 nm × 2.1 mm) packed with 1.7 μm particle size stationary phase. Recovery was higher than 88% and detection limits ranged between 12.5-23.7 ng/L for the four estrogens, with the RSD ranging from 7% to 11%. The method was successfully applied to determine E2 and EE2 in simulated natural water, which found that about 70% of E2 was degraded (with a half-life of about 30 hr) within 48 hr and about 55% of EE2 was degraded (with a half-life of about 36 hr). Low levels of El were found, however E3 was undetectable during the process.
Alternative Splicing of the Porcine Glycogen Synthase Kinase 3β (GSK-3β) Gene with Differential Expression Patterns and Regulatory Functions
Linjie Wang, Bo Zuo, Dequan Xu, Zuqing Ren, Hongping Zhang, Xuewei Li, Minggang Lei, Yuanzhu Xiong
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0040250
Abstract: Background Glycogen synthase kinase 3 (GSK3α and GSK3β) are serine/threonine kinases involved in numerous cellular processes and diverse diseases including mood disorders, Alzheimer’s disease, diabetes, and cancer. However, in pigs, the information on GSK3 is very limited. Identification and characterization of pig GSK3 are not only important for pig genetic improvement, but also contribute to the understanding and development of porcine models for human disease prevention and treatment. Methodology Five different isoforms of GSK3β were identified in porcine different tissues, in which three isoforms are novel. These isoforms had differential expression patterns in the fetal and adult of the porcine different tissues. The mRNA expression level of GSK3β isoforms was differentially regulated during the course of the insulin treatment, suggesting that different GSK3β isoforms may have different roles in insulin signaling pathway. Moreover, GSK3β5 had a different role on regulating the glycogen synthase activity, phosphorylation and the expression of porcine GYS1 and GYS2 gene compared to other GSK3β isoforms. Conclusions We are the first to report five different isoforms of GSK3β identified from the porcine different tissues. Splice variants of GSK3β exhibit differential activity towards glycogen synthase. These results provide new insight into roles of the GSK3β on regulating glycogen metabolism.
Two New Triterpenoids from Photinia serrulata
Yaling Song,Yuehu Wang,Qing Lu,Jinming Gao,Minggang Bi,Yongxian Cheng
Molecules , 2007, DOI: 10.3390/12122599
Abstract: Two new triterpenoids, 2α,3β,11α,13β-tetrahydroxy-12-ketooleanan-28-oic acid(1) and 3β-hydroxy-12-keto-9(11)-ursen-28,13β-olide (2) were isolated from the leaves ofPhotinia serrulata. Their structures were identified by spectral methods. Compounds 1 and2 were assessed for cytotoxic activity against three human tumor cell lines (A-549, HCT-8,and BEL-7402), and they showed no cytotoxic effects at concentrations up to 5μg/mL.
Different Expression Patterns of Heart and Adipocyte Fatty Acid-Binding Protein Gene During Porcine Skeletal Muscle Development
Linjie Wang,Jing Jiang,Li Li,Hongping Zhang,Minggang Lei,Yuanzhu Xiong
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.700.703
Abstract: The pig FABP3 (heart Fatty Acid-Binding Protein) and FABP4 (adipocyte Fatty Acid-Binding Protein) genes play an important role in intracellular fatty acid transport and considered to be candidate genes for Intramuscular Fat content (IMF) trait in pigs. In this study, the expression profiling of FABP3 and FABP4 genes was investigated in two pig breeds differing in muscularity (Yorkshire and Meishan) at four stages (fetal 65 days and postnatal 3, 60 and 120 days). The expression of FABP3 and FABP4 was significantly different in porcine skeletal muscle among different developmental stages and between the two breeds. This result suggests that the pig FABP3 and FABP4 may be important genes for meat quality and provides useful information for further studies on their roles in skeletal muscle intramuscular fat deposit.
Common model analysis and improvement of particle swarm optimizer

Feng PAN,Jie CHEN,Minggang GAN,Guanghui WANG,Tao CAI,

控制理论与应用 , 2007,
Abstract: Particle swarm optimizer (PSO), a new evolutionary computation algorithm, exhibits good performance for optimization problems, although PSO can not guarantee convergence of a global minimum, even a local minimum. However, there are some adjustable parameters and restrictive conditions which can affect performance of the algorithm. In this paper, the algorithm are analyzed as a time-varying dynamic system, and the sufficient conditions for asymptotic stability of acceleration factors, increment of acceleration factors and inertia weight are deduced. The value of the inertia weight is enhanced to (?1, 1). Based on the deduced principle of acceleration factors, a new adaptive PSO algorithmharmonious PSO (HPSO) is proposed. Furthermore it is proved that HPSO is a global search algorithm. In the experiments, HPSO are used to the model identification of a linear motor driving servo system. An Akaike information criteria based fitness function is designed and the algorithms can not only estimate the parameters, but also determine the order of the model simultaneously. The results demonstrate the effectiveness of HPSO.
Evaluation of the CENTURY Model Using Long-Term Fertilization Trials under Corn-Wheat Cropping Systems in the Typical Croplands of China
Rihuan Cong, Xiujun Wang, Minggang Xu, Stephen M. Ogle, William J. Parton
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095142
Abstract: Soil organic matter models are widely used to study soil organic carbon (SOC) dynamics. Here, we used the CENTURY model to simulate SOC in wheat-corn cropping systems at three long-term fertilization trials. Our study indicates that CENTURY can simulate fertilization effects on SOC dynamics under different climate and soil conditions. The normalized root mean square error is less than 15% for all the treatments. Soil carbon presents various changes under different fertilization management. Treatment with straw return would enhance SOC to a relatively stable level whereas chemical fertilization affects SOC differently across the three sites. After running CENTURY over the period of 1990–2050, the SOC levels are predicted to increase from 31.8 to 52.1 Mg ha?1 across the three sites. We estimate that the carbon sequestration potential between 1990 and 2050 would be 9.4–35.7 Mg ha?1 under the current high manure application at the three sites. Analysis of SOC in each carbon pool indicates that long-term fertilization enhances the slow pool proportion but decreases the passive pool proportion. Model results suggest that change in the slow carbon pool is the major driver of the overall trends in SOC stocks under long-term fertilization.
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